使用 SwiftUI 实现 Apple Pay

Question

这是我第一次在一个大项目中使用 PassKit 和 SwiftUI。我正在尝试实现 Apple Pay SwiftUI，并且由于还没有本地方式来实现，因此我尝试将 PKPaymentAuthorizationViewController 包装在 UIViewControllerRepresentable 中，但我不确定我是否正确执行此操作。

该视图显示正确，并且在单击它付款时似乎可以正常工作。我通过将视图绑定到 isPresentingApplePay bool 来控制显示窗口（见下文）。应该关闭窗口时会发生问题。点击cancel按钮不会关闭视图；有时它甚至不调用 paymentAuthorizationViewControllerDidFinish 委托函数。提交付款后也会发生同样的事情。有时会调用 didFinish 委托，但不会取消视图。我尝试传递绑定变量 isPresentingApplePay 并将其从 didFinish设置为false但它没有做任何事情。让视图消失的唯一方法是点击苹果支付窗口外的任何部分。

有谁知道我做错了什么？有什么我完全想念的吗？

通过将视图绑定到 if statement

这是我的 PKPaymentAuthorizationViewController 包装器：

import Foundation
import PassKit
import SwiftUI

struct ApplePayController: UIViewControllerRepresentable {
    @Environment(\.presentationMode) var presentationMode
    @EnvironmentObject var userData: UserData
    @Binding var purchase: Purchase
    @Binding var isPresenting: Bool

    let items: [PKPaymentSummaryItem]

    func updateUIViewController(_ uiViewController: PKPaymentAuthorizationViewController, context: Context) {

    }

    typealias UIViewControllerType = PKPaymentAuthorizationViewController


    func makeUIViewController(context: Context) ->  PKPaymentAuthorizationViewController {
        let applePayManager = ApplePayManager(items: items)
        let apm = applePayManager.paymentViewController()!
        apm.delegate = context.coordinator
        return apm
    }

    func makeCoordinator() -> Coordinator {
        Coordinator(self)
    }

    class Coordinator: NSObject, PKPaymentAuthorizationViewControllerDelegate  {
        var parent: ApplePayController

        init(_ parent: ApplePayController) {
            self.parent = parent
        }

        func paymentAuthorizationViewControllerDidFinish(_ controller: PKPaymentAuthorizationViewController) {
            controller.dismiss(animated: true) {
                    self.parent.isPresenting = false
                }
        }

        func paymentAuthorizationViewController(_ controller: PKPaymentAuthorizationViewController, didAuthorizePayment payment: PKPayment, handler completion: @escaping (PKPaymentAuthorizationResult) -> Void) {
            print("did authorize payment")

        }

        func paymentAuthorizationViewControllerWillAuthorizePayment(_ controller: PKPaymentAuthorizationViewController) {
            print("Will authorize payment")
        }
    }

    class ApplePayManager: NSObject {
        let currencyCode: String
        let countryCode: String
        let merchantID: String
        let paymentNetworks: [PKPaymentNetwork]
        let items: [PKPaymentSummaryItem]

        init(items: [PKPaymentSummaryItem],
               currencyCode: String = "USD",
               countryCode: String = "US",
               merchantID: String = "xxx.merchant.xxx",
               paymentNetworks: [PKPaymentNetwork] = [PKPaymentNetwork.amex, PKPaymentNetwork.masterCard, PKPaymentNetwork.visa]) {
            self.items = items
            self.currencyCode = currencyCode
            self.countryCode = countryCode
            self.merchantID = merchantID
            self.paymentNetworks = paymentNetworks
        }

        func paymentViewController() -> PKPaymentAuthorizationViewController? {
            if PKPaymentAuthorizationViewController.canMakePayments(usingNetworks: paymentNetworks) {
                let request = PKPaymentRequest()
                request.currencyCode = self.currencyCode
                request.countryCode = self.countryCode
                request.supportedNetworks = paymentNetworks
                request.merchantIdentifier = self.merchantID
                request.paymentSummaryItems = items
                request.merchantCapabilities = [.capabilityCredit, .capabilityDebit]
                return PKPaymentAuthorizationViewController(paymentRequest: request)
            }
            return nil
        }
    }
}

这就是我在 UIView 中显示它的方式：

if isPresentingApplePay {
    ApplePayController(purchase: self.$currentOrder.purchase, isPresenting: $isPresentingApplePay, items: self.createOrder(with: self.currentOrder.purchase)).environmentObject(self.userData)
}

Answer 1

我遇到了类似的问题，然后我通过使用另一种不与 UIViewControllerRepresentable 接口的方法解决了这个问题。相反，我创建了一个单独的类来处理 Apple Pay，如下所示

import PassKit

typealias PaymentCompletionHandler = (Bool) -> Void

class PaymentHandler: NSObject {

static let supportedNetworks: [PKPaymentNetwork] = [
    .amex,
    .masterCard,
    .visa
]

var paymentController: PKPaymentAuthorizationController?
var paymentSummaryItems = [PKPaymentSummaryItem]()
var paymentStatus = PKPaymentAuthorizationStatus.failure
var completionHandler: PaymentCompletionHandler?

func startPayment(completion: @escaping PaymentCompletionHandler) {

    let amount = PKPaymentSummaryItem(label: "Amount", amount: NSDecimalNumber(string: "8.88"), type: .final)
    let tax = PKPaymentSummaryItem(label: "Tax", amount: NSDecimalNumber(string: "1.12"), type: .final)
    let total = PKPaymentSummaryItem(label: "ToTal", amount: NSDecimalNumber(string: "10.00"), type: .pending)

    paymentSummaryItems = [amount, tax, total];
    completionHandler = completion

    // Create our payment request
    let paymentRequest = PKPaymentRequest()
    paymentRequest.paymentSummaryItems = paymentSummaryItems
    paymentRequest.merchantIdentifier = "merchant.com.YOURDOMAIN.YOURAPPNAME"
    paymentRequest.merchantCapabilities = .capability3DS
    paymentRequest.countryCode = "US"
    paymentRequest.currencyCode = "USD"
    paymentRequest.requiredShippingContactFields = [.phoneNumber, .emailAddress]
    paymentRequest.supportedNetworks = PaymentHandler.supportedNetworks

    // Display our payment request
    paymentController = PKPaymentAuthorizationController(paymentRequest: paymentRequest)
    paymentController?.delegate = self
    paymentController?.present(completion: { (presented: Bool) in
        if presented {
            NSLog("Presented payment controller")
        } else {
            NSLog("Failed to present payment controller")
            self.completionHandler!(false)
         }
     })
  }
}

/*
    PKPaymentAuthorizationControllerDelegate conformance.
*/
extension PaymentHandler: PKPaymentAuthorizationControllerDelegate {

func paymentAuthorizationController(_ controller: PKPaymentAuthorizationController, didAuthorizePayment payment: PKPayment, completion: @escaping (PKPaymentAuthorizationStatus) -> Void) {

    // Perform some very basic validation on the provided contact information
    if payment.shippingContact?.emailAddress == nil || payment.shippingContact?.phoneNumber == nil {
        paymentStatus = .failure
    } else {
        // Here you would send the payment token to your server or payment provider to process
        // Once processed, return an appropriate status in the completion handler (success, failure, etc)
        paymentStatus = .success
    }

    completion(paymentStatus)
}

func paymentAuthorizationControllerDidFinish(_ controller: PKPaymentAuthorizationController) {
    controller.dismiss {
        DispatchQueue.main.async {
            if self.paymentStatus == .success {
                self.completionHandler!(true)
            } else {
                self.completionHandler!(false)
            }
        }
    }
}

}

并为 Apple Pay 弹出窗口使用了以下按钮代码。

struct ContentView: View {

let paymentHandler = PaymentHandler()

var body: some View {
    Button(action: {
            self.paymentHandler.startPayment { (success) in
                if success {
                    print("Success")
                } else {
                    print("Failed")
                }
            }
        }, label: {
            Text("PAY WITH ? APPLE")
            .font(Font.custom("HelveticaNeue-Bold", size: 16))
            .padding(10)
            .foregroundColor(.white)
    }
}

}

最后，它工作正常